Setts



W, A. READY y PRESSURE GAUGE Filed Jan.

' Apr. 1,7, '1923.

A[7711@ TL 074' Patented Apr. 17, 1923.

UNITED STATES PATENT OFFICE.

WILLIAM A. READY, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO NATIONALCOMPANY, 0F CAMBRIDGE, MASSACHUSETTS, A CORPORATION OF MASSACHU-PRESSURE GAUGE.

Application ined January 1o, 192i.

To all 'whom t may concern:

Be it known that I, Willman A. READY, a citizen of the United States,residing at Brookline, in the county of Norfolk and State ofMassachusetts, have invented new and useful Improvements in PressureGauges, of which the following is a specification.

This invention relates to a gauge adapted to be used for indicatingpressures at different portions of a furnace having a forced draft.

The object of the invention is to provide a ,gauge of the character setforth which can be clearly and easily read and in which. the scale, bymeans of which the different pressures are to be determined, will not besoiled and rendered diificult of observation by reason of the localityin which the gauge is placed. Gauges of this character are usuallyplaced in boiler rooms and soon become covered with smoke and soot andare very difiicult to read.

Another object of the invention is to provide a gauge in which there areno stuffing): boxes or cemented joints exposed to liquid pressure.

A further object of the invention is to provide a multiple gauge inwhich any gauge tube may be removed without interfering with theoperation of the other units.

In the gauge of this invention the gauge tube is immersed in liquidcontained in a re ceptacle, the upper end of the tube beine; adapted tobe connected to a source of pressure and the lower end of the tube beingleft free and open, so that there is no tendency to crack the gauge tubedue to unequal eX- pansion between the glass of the tube and -the metalwhich supports it.

The scale which is used in connection with the gauge tube is madeadjustable to compensate for evaporation of liquid in the chamber` orcontainer. In order to render the device easily and clearly readable anindicator is provided adjacent to the scale and which is adjustable soas to indicate the normal pressure. Y

Further advantages secured by the construction of the device of thisinvention are that the receptacle for the liquid is dusttight and easilytaken apart to be cleaned and the condition and level of the liquid inthe container are always in plain sight.

To these ends the invention consists in the Serial No. 436,160.

combination and arrangement of parts set forth in the followingspecification and particularly pointed out in the claims.

Referring to the drawingsi Figure 1 is a vertical sectional elevation ofmy improved gauge taken on line 1 1, Fig. 3.

Fig. 2 is a sectional elevation taken on line 2 2, Fig. 3.

Fig. 3 is a sectional plan taken on line 3-3, Figure 1.

Like numerals refer to like parts 'throughout the several views of thedrawings.

In the drawings. 5 is a container made of transparent material andpreferably rec* tangular in cross section. Said container is clampedbetween a bottom member 6 and a top member 7 by rods 8, a gasket 9beingY interposed between the open top of the container 5 and the topmember 7. The top member 7 is provided with. a plug 10 having;l a vent11 extendingr upwardly from the bottom thereof and outwardly at one sideas illustrated in Fig. 2. The aperture 12 in the top 7 which is closedby the plug 10, is utilized when it is desired to place liquid in thecontainer 5. The container 5 is provided with a partition 13 whichdivides the same into two chambers 111 and 15. In each of the chambers14 and 1,5 there is a glass tube 16 which is open at the bottom andterminates at a short distance from the bottoiin of the container 5. Theupper endv of the tube 16 projects into and is fastened to a nipple 17which. has screw-threaded engage ment with the top member 7 and isadapted to be connected by a hose or tube to any dcsired part of aforced draft system whereby pressure from such part of the system may beconveyed into the tube 16. A scale 18 consisting of a flat piece ofmetal provided with -graduations 19 is klocated immediately adjacent toand .in the rear of the tube 16, said scale is adjusted upwardly anddownwardly by means of a screw 20 which extends through the top 7 andhas screwthreaded engagement with an ear 21 provided on the rear face ofthe scale 18. A spring 22 is interposed between the ear 21 and the top 7so that by rotating the screw 20 in onevdirection or the other the scale18 may be raised and lowered to compensate for evaporation of liquid inthe chamber. An indicator 23 is located between the gauge tube 16 andthe scale 18 and projects through a slot 2st to the rear side o i thescale 18'- where it is engaged by a vertical screw 25 which projectsthrough the top 7 and also projects through a pair ot brackets 26 and 27which are fastened to the top and bottoni respectively ot' the scale 18.

il positioning plate 28 is provided in the bottom of each of thechambers 14 and 15 and the gauge tube 16 and screw 25 project throughthis positioning plate at their lower ends. Said positioning plate isfurther provided with a slot 29 which extends thereacross and' receivesthe lower end of the yscale 18. The positioning plate is loosely mountedin the bottom of the container, so that while it positions the lowerends of the tube 16, screw 25 and scale 18 approximately, it does notrigidly position the lower ends of these members so that a 'variation inposition yof the tube 16, due to a dili'erence in expansion andcontraction of the metal top 7 i and the glass container 5, will notresult in crackingthe tube 16. Moreover, it is very easy to remove thetube 16 by kunscrewing the nipple 17 without disturbing. any of theother parts of the gauge and also it will be understood that it it isdesired to clean out the container 5, the top 7 can be removed byunscrewing the rods 8, taking ott the cover and with the cover removingthe gauge' tubes 16, the screws v25 and the scales 18.

ln the foregoing description of my invention the gauge is illustrated ascomprising two units. When using this form, one unit could be connectedby means of a tube to a compartment below the damper of a furnace, whilethe second unit would be connected to the draft compartment of saidfurnace beneath the Stoker, the gauge suitably calibrated would thenindicate pressure above or below atmospheric pressure in these twocompartments and would assist the fireman in the proper and ellicientoperation oi? the boileri It will be understood that while I havedescribed and illustrated my invention as a two-unit gauge, I do notwish to be confined to a gauge with two units. I may use any number otunits desired. Y TheV general operation of my invention hereinbeforespecifically described is as follows: Assuming the parts of the gauge tobe assembled in the relative positions illustrated in the drawings andoil of a nonvolatile nature contained in the chambers 14 and 15 and thegauge tube 1.6 at substantially the height of the zero mark on thescale.v 'The nipples 17 of the two chambers 14: "and 15 are connected bytubes respectively to the compartment below the damper of the furnace,and to the draft compartment of the furnace.l Under these conditions,assuming that there is a re in the furnace and that the blower is inoperation the pressure in the blower ordraft compartmentwill becommunicated to the gauge tube 16 in the chamber 15 and the level of theliquid in said tube 16 will fall to a.l certain-position: on the scale,say to the line 2. This will denote that there is a pressure equal toltwo inches ot' water in the draft compartment, on the other hand, therebeing a suction in the stolrer or compartment below the damper theliquid in the gauge 16, which is located in the chamber 14- and isconnected to Said stoker will show a rise above the zero point denotingthat there is a slight vacuum in this compartment, which measured on thescale would amount to a certain number of inches of water pressure'. Bytrial it maybe determined the best levels at which. to maintain thesepressures in order to get the most eihcient operation and when this hasbeen determined the indicators are set at these levels in theirrespective chambers and the fireman or operator instructed to keep thedra-ft andv pressure at these levels.

l claim:

1. A ,gauge having, in combination, a con-` tainer for liquid. avertical tube of transparent material located in said container and openat its opposite ends. thc lower end ot said tube terminatingr adjacentto the bottom otsaid container and spaced apart therefrom. means toconnect the upper end of said tube to a source ot pressure and avertical scale wholly within said container' adjacent to said tube. l

2. A gauge having, in combination, a container ttor liquid. verticaltube of` transparent material located in said container and open at itsopposite ends, the lower end ot said tube terminating adjacent to the'bottom ot said container and spaced. apart therefrom, means to connectthe upper end oiz said tube to a source ot' pressure. a vortical scalewholly within said container adjacent to said tube and means operablefrom the exterior oi said container to raise and lower said scale.

3. A gauge having, inl combination, a container igor liquid, a verticaltube ot' transparent material located in said container and open at its`opposite ends, the lower 'end ot said tube terminating adjacent to thebottom ot said container and spaced apart therefrom, means to connectthe upper end ot said tube to a source ot pressure, a vertical scalewholly within said container adjacent to said tube, and a screwprojecting through the top of said container and engagingsaid scale,whereby the latter may be raised and lowered. l

4l. A gauge having, in combination, a container for liquid, a verticaltube of transparent material located in said container .and open at itsopposite ends. the lower end ot said tube terminating adjacent to thebottom et said container and spaced apart therefrom. means to connectthe upper end of said tube to a source oi' pressure, a 'vertical scalewholly within said container adjacent to said tube, a screw projectingthrough the top ot said container and having screw-threaded engagementwith said scale and a spring interposed between the latter and saidcontainer, whereby said scale may be raised and lowered.

5. A gauge having,r in combination, a con- 'rainer for liquid, avertical tube ot transparent material located in said container and openat itsl opposite ends, the lower end ot said tube terminating adjacentto the bottom ot said container and spaced apart therefrom, means toconnect the upper end ot said tube to a source ot pressure, a verticalscale wholly within said container' adjacent to said tube, an indicatorwithin said container and adjacent to the front tace ot said scale andmeans to raise and lower said indicator.

G. A gauge having, in combination, a container tor liquid, a verticaltube ot transparent material located in said container and open at itsopposite ends, the lower end ot said tube terminating adjacent to thebottoni ot said container and spaced apart therefrom, means to connectthe upper end of said tube to a source ot pressure, a vertical scalewholly vwithin said container adjacent to said tube, an indicator withinsaid container and adjacent to the front tace of said scale, and avertical screw operable from the exterior of said container and havingscrew-threaded engagement. with said indicator, whereby said indicatormay be raised and lowered,

7. A gauge having, in combination, a container tor liquid, a verticaltube ot' transparent 1material located in said container and open at.its opposite ends, the lower end ot said tube terminating adjacent tothe bot tom ot said container and spaced apart therefrom, means toconnect the upper end of said tube to a source of pressure, a vertical.scale in said container adjacent to said tube, an indicator locatedadjacent. to the 'liront 'face of said scale and projecting rearwardlythrough a slot provided in the latter, a screw operable from theexterior of said container, and a pair ot brackets tast to the top andbottom of said scale on the rear tace thereorI through whichsaid screwprojects, said screw having screw-threaded engagement with saidindicator, whereby said indicator may be raised and lowered.

8. A gauge having, in combination, a container tor liquid, a verticaltube ot transparent material located in said container and open at itsopposite ends, the lower end ot said tube terminating adjacent to thebottom ot said container and spaced apart therefrom, means-to connectthe upper end of said tube to a source of pressure, a vertical scale insaid container adjacent to said tube, an indicator located adjacent tothe iront tace ot said scale and projecting rearwardly through a slotprovided in the latter, a screw operable from the exterior of saidcontainer, a pair of brackets tast to the top and bottom ot said scaleon the rear face thereof through which said screw projects, said screwhaving screw-threaded engagement with said indicator, and a springencircling said screw and interposed therebetween and the top of saidcontainer, whereby said indicator may be raised and lowered.

9. A gauge having, in combination, a container for liquid, a verticaltube of transparent material located in said container and open at itsopposite ends, the lower end of said tube terminating adjacent to thebottom of said container and spaced apart therefrom, means to connectthe upper end of said tube to a source of pressure and a positioningplate loosely mounted at the bottom of said container through which thelower end of said vertical tube projects.

10. A gauge having, in combination, a container for liquid, a verticaltube of transparent material located in said container and open at itsopposite ends, the lower end of said tube terminating adjacent to thebottom ot said container and spaced apart therefrom, means to connectthe upper end of said tube to a source ot pressure, a verti! cal scalein said container adjacent to said tube and a positioning plate throughwhich the lower end of said tube projects, said positioning plate beingprovided with a slot extending thereacross into which slot the lower endot said scale projects.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

WILLIAM A. READY.

Witnesses:

FRANKLIN E. Low, KATHYRN M. JOYCE.

